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error in Transient analysis (SPECTRE-16929)

mirtaji65

I designed amplifier. This amplifier alone works well, I did various analyzes (tran.dc.ac ) on it
I want to use a digital to analog converter next to it.This DAC alone works well
but But when I use both blocks dac and op amp together and do the Transient analysis, I got the following error message

Error found by spectre at time = 1 us during transient analysis `tran'.
ERROR (SPECTRE-16929): Transient analysis is simulating with step size less than 200e-21 s for 1000 steps.
Change option `max_consecutive_minstep' to adjust the allowed maximum number of consecutive steps to be less than 10*MinStep.

virtuoso version 6.1.7-64b

How can I solve this problem?

Thank

Parents

  • Dear mirtaj65,

    mirtaji65 said:
    I designed amplifier. This amplifier alone works well, I did various analyzes (tran.dc.ac ) on it
    I want to use a digital to analog converter next to it.This DAC alone works well
    but But when I use both blocks dac and op amp together and do the Transient analysis, I got the following error message

    Writing for myself only, there is not enough information in your simulation setup and circuit blocks for me to provide any potentially useful hints as to what you might do. Examples of the initial questions in my mind that might provide me some thoughts for you are:

    1. What is the full spectre.out file?

    2. What is the netlist transient analysis command (full netlist if possible)? Specifically, I am trying to understand the specific spectre simulator you are using and its various accuracy options.

    3. Is there a power supply to your opamp? It appears all its terminals are set to ground.

    4. What exactly is the current source driving in your DAC?

    5. What event is happening at 1 us when the simulation provides the error (i.e., is there an introduction of a pulse or other signal in either of the two subcircuits?)

    6. Have you enabled the +diagnose option  to provide any more clues as to the failure mechanism?

    I apologize for my lack of understanding...perhaps other Forum members have enough information with what you have provided in your Forum post...but I sadly do not!

    Shawn

Reply

  • Dear mirtaj65,

    mirtaji65 said:
    I designed amplifier. This amplifier alone works well, I did various analyzes (tran.dc.ac ) on it
    I want to use a digital to analog converter next to it.This DAC alone works well
    but But when I use both blocks dac and op amp together and do the Transient analysis, I got the following error message

    Writing for myself only, there is not enough information in your simulation setup and circuit blocks for me to provide any potentially useful hints as to what you might do. Examples of the initial questions in my mind that might provide me some thoughts for you are:

    1. What is the full spectre.out file?

    2. What is the netlist transient analysis command (full netlist if possible)? Specifically, I am trying to understand the specific spectre simulator you are using and its various accuracy options.

    3. Is there a power supply to your opamp? It appears all its terminals are set to ground.

    4. What exactly is the current source driving in your DAC?

    5. What event is happening at 1 us when the simulation provides the error (i.e., is there an introduction of a pulse or other signal in either of the two subcircuits?)

    6. Have you enabled the +diagnose option  to provide any more clues as to the failure mechanism?

    I apologize for my lack of understanding...perhaps other Forum members have enough information with what you have provided in your Forum post...but I sadly do not!

    Shawn

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